Lake Motosu (Motosu-ko)
Located at the western foot of Mt. Fuji, the lake has a circumference of 12.6 km, an area of 4.7 square km, and a depth of 122 meters. Among the Fuji Five Lakes, it has a particularly large amount of untouched nature. The quality of the water is excellent, and it boasts "the highest transparency in the Honshu region".
The reflection of Mt. Fuji on the 1,000 yen bill was actually photographed right here at Lake Motosu.